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Could anyone exlain why use h.hacker_id instead of Hackers.hacker_id? If you did not show that Hackers as h, how could you use h. to represents Table Hackers?
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Could anyone exlain why use h.hacker_id instead of Hackers.hacker_id? If you did not show that Hackers as h, how could you use h. to represents Table Hackers?